SG Heritage Dictionary

Duality Roget’s Thesaurus §89

N. duality, dualism, duplicity, biplicity, biformity, polarity, two, deuce, couple, duet, brace, pair, cheeks, twins, castor and pollux, gemini, siamese twins, fellows, yoke, conjugation, dispermy, doublets, dyad, span

V. pair, couple, bracket, yoke, conduplicate, mate, span

Adj. two, twin, dual, dualistic, double, binary, binomial, twin, biparous, dyadic, conduplicate, duplex, biduous, binate, diphyletic, dispermic, unijugate, tete-a-tete, coupled, conjugate, both, both the one and the other